It is the rule in pulp: no one and nothing is more interesting to a bizarre creature than a comely female human, and this cover by of the February 1940 Fantastic Adventures by Robert Fuqua (1905-1959) exemplifies the rule. I think it is probably illustrating Bertrand L. Shurtleff’s story “New York Fights the Termanites,”, although an interior an interior illustration by Julian S. Krupa (1913-1989) suggests a different conception of the beasties.
It looks like a pretty normal rush-hour on the 6 train to me.
This is Amazing Stories for September 1940, cover by Robert Fuqua. The ISFDB entry for this issue is here. I found this version of the cover at Pulp Covers, which also provides us with a back cover:
The included text there is something to behold: “Life on Europa (moon of Jupiter). This member of the solar system is only slightly smaller than Earth’s moon. Science knows little about it, and thus, lacking conclusive observation, our artist pictures its life in imaginative style (see page 144 for details).” Sure, why not?